Fireplace



Jan- 2, 19 A. R. FREDLUND FIREPLACE Filed May 14', 1938 2 Sheets-Sheet l g] wu c Mom 1191:8111. Fredlund Jan. 2, 1940. A. R. FREDLUND FIREPLACE Filed' Mav 14, 1958 2 Sheets-Sheet 2 Patented Ian. 2, 194d I I 1 v d p I FIREPLACE v I I I I August Robert FredIund Santa Barbara, Application May 14, 1938, Serial No. 208,072 j 8 Claims. (Cl. 126121) p I e I This invention relates to a fireplace. Figure 8 is a view in perspective of a protective UNITED STATES TENT OFFic-E I An object of the invention is the provision of plate! at the forward end of the fireplace. 'a' fireplace which is made of heavy cold rolled -Referring more particularly to the drawings,

black iron or cast iron in which a drum 'is mount- 10 designates a base member below an open fir'ey ed and tapered towards the center so that the hot place l'l which" has a floor I2. A grate I3 is 5 gases of combustion must pass through a tortuous mounted above the floor at the rear of the firepath before they escape from the-center of the box and is supported in any approved manner as coiled drum and are directed to a central flue, by legs I4 from the floor I2.' 1

the cold air being carried up over the coiled Referring" ore particularly to Fig. 4, it will be 0 drum being rapidly andeconomically heated beseen that the housing .of the fireplace consists of fore it is'passecl-out into the room; 1 -'metal side plates I5 and I6 which are provided Another object of the invention is the provision with a V-shaped horizontal flange N that conof an all-metal fireplace which may be built into nectsthe upper sections I8 and I9, respectively,

the fireplace or. which may be moved into the to the plates I5 and I6. Plates 2B and 2|, refireplace as aunit with the walls of the unit being speotively, are connected to the inner faces of 16 insulated to prevent fire hazards while providing theplates Ill-and [5. It will be noted that the for a tortuous path of the gases of combustion plates I8 and 2B and the plates I9 and ZI are from the firebox to a flue and presenting to inprovided with smaller passages 22 for a purpose coming cold air a bro-ad heating surface befor to be presently explained. The forward edges the air is conducted into-a room. of the plates I5, I6, I8 and I9 are providedwith 20 Al-further object of the invention is the prolugs 23 which extend laterally therefrom and, vision of an all-metal insulated fireplace having are provided with openings to receive bolts con-' fresh air conduits for supplying the fireplace with necting the finishing plates 24 to the front face the proper amount of air and with a spiral flue of the fireplace. v i

25 providing an ever-decreasing coiled passage for The finishing plate 24, which forms a decora- 25 the combustion gases before said gasesare distive front for the fireplace and shown more charged into a common flue sothat fresh air particularly in Fig. 7, consist of a longitudinal whichwill be discharged into the room-will come plate 25, a top plate 26 and a vertically disposed in'contact with a large heating surface and over grill 21; 'These plates may be cast in one piece the most intensely heated portions of the coiled or they may be made separately and connectedgo flue. l l. together. 'Each of these plates is provided with This invention will be best understood from 'a flutes 28'ior ornamenting the suriaceof the same. consideration of the following detailed de'scrip- The platesZB extend vertically on each side of Hon, invview of the accompanying drawings formthe furnace while-the plate. 26 and 21 extend ing a part of the specification; nevertheless, it across the top and front. The grillwork permits 35 is to be understood that the invention is" not heated air from the fireplace to pass into the confined to the disclosure, being susceptible of room.;; such changes and modifications as define no The-rear wall of the furnace is composed of a material departure from the salient features of pair oflmetal sheets 30 and 3I which are spaced the invention as expressed in the appended claims, from each other and the space between the sheets Inthe drawings: i is filled with insulating material 32. It will be ;-Figure 1 is a vertical section of my fireplace .noted that these plates have a straight vertical taken along the line II of Fig.- 2, wall and a curved top 33' with the plate 30 at Figure 2 is a front view of the fireplace, i its forward end having a vertically disposed flange Figure 3' is a vertical transverse section taken 34 which is secured to thedecorative plate 26.

along theline 3-3 of Fig. 1, The plates alongtheir side edges are provided *Figure 4 is a view in perspective of a .metal with perforations 35 to receive bolts for connectframework forming the housing for the fireplace, ing the'plates to perforated lugs 36 which extend Figure 5 is a view in perspective of the insu-' inwardly from the'sidejedges of the side walls of 0 lated rear wall of the fireplace, the housing. The bottom of the sheet 30 extends Figure'fi is a view in perspective of a convolute below the bottom of the sheet 3I and is conflue located within the fireplace, nected-at 31 to the walls'of an air chamber 38.

'Figure '7 is a fragmentary view in perspective A tortuous conduit is provided for conducting showing one form of a decorative finish for the the hot-gases of combustion away'from the open front of the fireplace, and I fireplace or chamber and this conduit consists of a sheet of metal which is formed into a vertical wall 48 spaced from the rear wall or sheet of metal 30. The wall 40 is curved inwardly, as

shown at 4!, and gradually curved and rolled into a convolute passage to provide a tortuous passage, as indicated by the numeral 42, and this convolute passage is defined by the spiral walls 43, 44 and 55 and terminates in a central passage 4%.

The lower end of the wall 40 is connected at 4'! to one Wall of the fresh air supply conduit 38. The convolute portions of this wall, which form the flue 42, are connected by means of angle irons or lugs 48 to the side walls of the housing. The remaining portions of the walls of the convolute passage merely rest against lugs 50 for supporting the curved portions in position while permitting said curved portions toexpand or contract during changes of temperature.

The lower portions of each of the curved sections 43 and 44 are provided respectively with openings El and 52 which are closed by sliding doors 53 and 5 respectively. These doors may be opened for the removal of soot when necessary.

It will be noted, more particularly in Figs. 2 and 3, that curved pipes 55 and 55 extend from the opposite sides of the central member 450i the flue for carrying away the gases of combustion and conducting them to a chimney 51 which is normally located centrally of the fireplace. A

plate 58 is disposed withinthe centrally disposed.

flue 45 for causing the gases of combustion to flow in opposite directions and into the pipes 55 and 56.

A plate 55 is connected at El with the front wall 21 while the inner end of the plate is curved upwardly, as shown at 62, and terminates in close contact with the soot door 53. Angle irons 63 connect the upwardly curvedportion 62 of this plate with thefront wall Z'Las shown at 64.

It will be noted from Figs. 1, 2 and 4 that a plurality of rods 55 connect the side walls together above the fire chamber and these rods are located around the front, top and rear portion of the housing. A damper 10 controls the flow of air to the chamber H from a supply conduit ll. This damper is operated by a rod 12 which projects forwardly and terminates in a handle 13 at the front face of the fireplace.

Flues 15 are in communication at the upper ends with the space between the coiled portions as and 55 and these flues extend downwardly to outlet pipes shown at 16 (Fig. 1). These outlet pipes are controlled by dampers 'l'l which in turn are operated by rods 18 having a handle 19 at the forward part of the fireplace. The dampers 11 are normally closed during the initial stage of heating until the convoluted drum is hot. The dampers are then opened and the normal draft will draw a certain amount of the hot combustion gases back into the furnace to pass through the grate.

It will be noted that the fiues 15 are located upon opposite sides of the fireplace and open at their lower ends adjacent the grate.

The operation of my device is as follows: Before the fire is started the damper 11 is closed and after the convolute drum has been sufficiently heated this damper is opened so that exhaust gases will be carried back from the convolute drum to the firebox to insure complete combustion of the gaseous products.

' The upper end of the channel, indicated by the numeral "38a, which leads from the fresh air supply pipe 38 extends directly over the heated wall 4| and over the curved portion 43 of the drum. This hot air then is discharged through the grillwork at the upper end of the firebox.

The damper 70 controls the amount of fresh air to the grate l3 at all times.

The products of combustion from the grate pass upwardly along the inner face of the rear wall 40 and enter the convolute channel 42 and continue through this channel until they reach the central discharge channel 46. The baffle or plate 58 causes the products of combustion to pass outwardly in opposite directions through the curved pipes 55 and 56 where they meet in a common flue or chimney 51. As has been previously explained, some of the exhaust gases are carried back through the flues 15 to points beneath the grate l3.

It will be seen by this construction that an extended surface for the fresh air which is discharged into the room has been provided so that a very economical operation of the fireplace is had.

.While I have shown a readily removable fireplace which has its side walls and back formed of metal it will be appreciated that these Walls may be formedof fire brick as a permanent part of the fireplace .While the metal top and the metal panels at the front may be readilyremovable since they will be. made in standard sizes. The convolute flue, however, which is made of metal and readily replaceable, may have any number of coils depending upon the size of the fireplace. Where the space is restricted there will be less coils and these coils will be spaced further apart to provide the necessary draft; with the greater area of the side walls the coils may be closer together and the coils will be of a greater number. The effective transverse area of the space between the coils will always be such as to create the necessary draft.

I claim:

1. A fireplace comprising a grate, means form ing a convolute channel merging into a central passage and having its largest portion in a position of access to the products of combustion from a fire on the grate, a discharge fiue connected to the central passage, and means connecting a space beneath the grate to said convolute channel for bypassing some of the products of combustion from the flue for circulation through the grate.

2. A fireplace comprising a grate, a convolute flue conducting products of combustion from the grate'to a chimney and presenting a large surface area to fresh air, means conducting fresh air to and around the surface before said air is discharged into a room, said fiue progressively decreasing in width to a central horizontal position, and means conducting products of combustion from the central portion to the chimney.

3., A fireplace comprising a grate, a convolute flue conducting products of combustion from the grate to a chimney and presenting a large surface area to fresh air, means conducting fresh air to and around the surface before said air is discharged into a room, said flue terminating in a central horizontal conduit, a partition dividing the central conduit, conduits connected to the through the open end of the housing, the upper endof the plate being curved to provide a convolute passage for the products of combustion, a grate in the lower portion of the housing adjacent the metal plate, and means conducting products of combustion from said housing.

5. A fireplace comprising a metal housing having the front end open, a metal plate having the side edges secured to the side walls of the housing and spaced from the rear and top wall of the housing to provide a passage for fresh air to be heated, said air being discharged into a room through the open end of the housing, the upper end of the plate being curved in convolute form to provide a tortuous passage for the products of combustion, a grate in the lower portion of the housing, and means conducting the products of combustion from the central portion of the convolute form of the plate.

6. A fireplace comprising a metal housing having the front end open, a metal plate having the side edges secured to the side walls of the housing and spaced from the rear and top wall of the housing to provide a. passage for fresh air to be heated, said air being discharged into a room through the open end of the housing, the upper end of the plate being curved to provide a convolute passage and a centrally disposed central conduit for the products of combustion the convolute passage being in communication with the lower portion of the housing, a grate in said lower portion of the housing adjacent the plate so that the products of combustion will heat the plate, and means conducting the combustion products from the convolute passage.

7. A fireplace comprising a metal housing having the front end open, a metal plate having the side edges secured to the side walls of the housing and spaced from the rear and top wall of the housing to provide a passage for fresh air to be heated, said air being discharged into a room through the open end of the housing, the upper end of the plate being curved to provide a convolute passage and a centrally disposed central conduit for the products of combustion, the convolute passage being in communication with the lower portion of the housing, a grate in said lower portion of the housing, adjacent the plate so that the products of combustion will heat the plate, a partition dividing the central conduit, conduits connected to the ends of the central conduit and merging at the other end thereof into the chimney.

8. A fireplace comprising a metal housing having the front end open, a metal plate having the side edges secured to the sidewalls of theyhousing and spaced from the rear and top wall of the housing to provide a passage for fresh air to be heated, said air being discharged into a room through the open end of the housing, a grate in s the lower portion of the housing, the upper end of the plate being curved to provide a convolute passage for the products of combustion opening into the lower portion of the housing, a conduit connected with the convolute passage at approximately the center thereof for supplying the grate with heated products of combustion.

AUGUST ROBERT FREDLUND. 

